fix(core): initialize titleGenerator in __setDefaultMemory

[kagura-agent]

Summary

Closes #1232

When Memory is passed globally to VoltAgent (via the memory option), __setDefaultMemory updates conversationMemory but does not initialize titleGenerator. This causes generateTitle to silently fail — all conversations receive the fallback title "Conversation".

Changes

• MemoryManager: Added setTitleGenerator() method to allow updating the title generator after construction.
• Agent.__setDefaultMemory(): After calling setMemory(), now also calls createConversationTitleGenerator() and passes the result to setTitleGenerator(), ensuring title generation works regardless of whether memory is passed globally or per-agent.

Testing

• All 13 existing memory-manager.spec.ts tests pass.
• Verified via code inspection that the fix addresses the exact gap described in the issue: setMemory only set conversationMemory, leaving titleGenerator as undefined.

Summary by CodeRabbit

• Bug Fixes
  • Ensures conversation titles are correctly initialized and updated when default memory is applied so titles display reliably.
  • Allows the title-generation strategy to be updated at runtime so changes to how titles are created take effect immediately.

---

Summary by cubic

Initialize the conversation title generator when memory is set via VoltAgent.__setDefaultMemory, fixing #1232. Titles now generate correctly when memory is provided globally or per-agent, instead of the "Conversation" fallback.

• Bug Fixes
  • Added setTitleGenerator() to MemoryManager.
  • Agent.__setDefaultMemory() now sets the title generator with createConversationTitleGenerator(memory) after setMemory().

^{Written for commit 02b7c4a. Summary will update on new commits.}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d3c9877f-0c0f-47da-a2f7-1ee5d69c9c32

📥 Commits

Reviewing files that changed from the base of the PR and between 4df8fae and 02b7c4a.

📒 Files selected for processing (3)

• .changeset/fix-set-default-memory-title-generator.md
• packages/core/src/agent/agent.ts
• packages/core/src/memory/manager/memory-manager.ts

✅ Files skipped from review due to trivial changes (1)

• .changeset/fix-set-default-memory-title-generator.md

🚧 Files skipped from review as they are similar to previous changes (2)

• packages/core/src/memory/manager/memory-manager.ts
• packages/core/src/agent/agent.ts

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📝 Walkthrough

Walkthrough

Agent.__setDefaultMemory now also updates MemoryManager's conversation title generator when a default Memory is applied; a new MemoryManager.setTitleGenerator method was added and a Changeset entry recorded.

Changes

Cohort / File(s)	Summary
Title generator + default memory .changeset/fix-set-default-memory-title-generator.md, packages/core/src/agent/agent.ts, packages/core/src/memory/manager/memory-manager.ts	Adds MemoryManager.setTitleGenerator(...) and updates Agent.__setDefaultMemory to call createConversationTitleGenerator and apply the generator to the memory manager; adds Changeset metadata for a patch release.

Sequence Diagram(s)

sequenceDiagram
  participant VoltAgent
  participant Agent
  participant MemoryManager
  participant Memory

  VoltAgent->>Agent: __setDefaultMemory(memory: Memory)
  Agent->>Agent: createConversationTitleGenerator(memory)
  Agent->>MemoryManager: setTitleGenerator(titleGenerator)
  Agent->>MemoryManager: setMemory(memory)
  MemoryManager-->>Agent: updated state (conversationMemory + titleGenerator)

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• feat: add optional conversation title generation on conversation crea… #986 — Related PR that adds/updates conversation title-generation plumbing which this change integrates with.

Poem

🐰
I found a missing little spring,
Where titles slept without a ring.
A setter hopped in, swift and merry,
Now every chat has a bright new berry. 🍓✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main fix: initializing titleGenerator in __setDefaultMemory method.
Description check	✅ Passed	The description includes most required template sections: Summary with issue reference, Changes section detailing modifications, and Testing validation of existing tests.
Linked Issues check	✅ Passed	The PR directly addresses issue #1232 by adding setTitleGenerator() to MemoryManager and updating Agent.__setDefaultMemory() to initialize titleGenerator when memory is set globally, exactly matching the issue's expected behavior.
Out of Scope Changes check	✅ Passed	All changes (new setter in MemoryManager, updated __setDefaultMemory call, and changeset entry) are directly scoped to fixing the titleGenerator initialization issue described in #1232.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[cubic-dev-ai]

No issues found across 4 files

[changeset-bot]

🦋 Changeset detected

Latest commit: 02b7c4a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@voltagent/core	Patch

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